基于PC／104总线的陀螺漂移性能预测系统设计

陀螺仪是惯性导航系统的核心器件，陀螺漂移（包括常值漂移和随机漂移）影响着陀螺仪的工作精度。简要介绍了PC／104总线，在此基础上设计了陀螺漂移性能预测系统，分析了各个模块的作用。该系统具有快速准确的预测陀螺漂移性能，对提高整个导航系统的精度有着十分重要的意义。     

改进递阶GABP算法与一般BP算法在陀螺仪随机漂移建模中的应用分析

针对改进的递阶GABP算法的特点,将其应用于陀螺仪随机漂移建模.通过引入巴特莱特（Bartlett）提出的＂95%置信限＂理论,对改进递阶GABP算法与一般神经网络BP算法的陀螺仪随机漂移建模进行比较,分析得到改进递阶GABP算法更能在较短的时间内建立陀螺仪随机漂移误差的精准模型.     

基于时间序列分析方法的FOG随机漂移建模与辨识

为了对光纤陀螺（FOG）随机漂移（启动漂移、慢变漂移和快变漂移）的各项参数进行快速有效的辨识，建立了含未知模型参数（慢变漂移的相关系数）的FOG随机漂移状态方程模型，通过对FOG随机漂移进行时间序列分析，辨识了未知的模型参数以及慢变漂移和快变漂移的白噪声方差，以卡尔曼滤波／平滑技术计算了FOG随机漂移的3项分量。对实测的FOG随机漂移数据进行了模型辨识与适用性检验，结果表明，该方法能够准确计算FOG随机漂移的各项参数和分量。通过建立FOG随机漂移的状态方程模型，首次将时间序列分析方法与卡尔曼滤波／平滑技术相结合，快速计算了启动漂移、慢变漂移的相关系数以及慢变漂移和快变漂移的白噪声方差，这对于修正FOG单独工作或与其他设备组合时的导航误差具有重要的参考价值。     

基于卡尔曼滤波的陀螺仪阵列技术研究

多个相同型号的陀螺仪测量轴相互平行,测量同一个角速度信号所组成的阵列叫做陀螺阵列。通过研究陀螺阵列提高惯性测量精度的信息处理算法,建立单个微机电（MEMS）陀螺仪的两种不同漂移模型,利用Allan方差对漂移系数进行辨识,将辨识出的随机漂移系数应用于卡尔曼滤波。通过卡尔曼滤波将陀螺阵列的信息融合为一个较高精度的输出,证明了卡尔曼滤波的稳定性。通过实验对比了不同建模方法的优劣,并且验证了基于卡尔曼滤波的信息融合方法可以有效提高MEMS陀螺仪的精度。     

模糊神经网络在动调陀螺随机误差建模中的应用

为了提高使用精度,减少动力调谐陀螺仪（DTG）随机漂移的建模误差,首先基于连接机制构造一个模糊神经网络;然后,在此网络结构的基础上,提出了一种基于遗传算法的参数优化策略;最后用预处理后的实测DTG漂移数据建立模型并利用另一组DTG漂移数据对模型的有效性进行了验证。实验结果表明：用这种方法建立的模型能更好地描述动调陀螺仪的漂移特性,并加快了网络结构收敛过程的速度,同时,其补偿效果也有了很大的提高。     

微机电系统陀螺仪随机漂移误差建模与滤波研究

随机漂移是微机电系统(MEMS)陀螺的主要误差,建立其数学模型并在输出中加以补偿是抑制该项误差、提高MEMS陀螺精度的有效方法。采用Allan方差对MEMS陀螺实测数据进行了分析,并采用时间序列分析法建立了随机漂移模型。根据建立的漂移模型,就如何利用Kalman滤波抑制随机漂移误差进行了分析和研究。     

基于AR模型的光纤陀螺建模方法研究

作为新一代的光学陀螺仪,光纤陀螺的性能决定着惯性参考系统的精度,为了提高光纤陀螺的精度,本文提出了利用时间序列分析法中的AR模型[1]对光纤陀螺零漂数据进行分析,采用最小二乘法对数据进行了处理和拟和,并在此基础上应用卡尔曼滤波算法对建模后光纤陀螺的漂移数据进行了滤波,有效地抑制了光纤陀螺中的随机误差,得到了陀螺信号的常项漂移趋势,提供了一种符合工程应用要求的光纤陀螺漂移模型。     

基于PC/104总线的陀螺漂移性能预测系统设计

陀螺仪是惯性导航系统的核心器件,陀螺漂移(包括常值漂移和随机漂移)影响着陀螺仪的工作精度.简要介绍了PC/104总线,在此基础上设计了陀螺漂移性能预测系统,分析了各个模块的作用.该系统具有快速准确的预测陀螺漂移性能,对提高整个导航系统的精度有着十分重要的意义.     

卡尔曼滤波在陀螺漂移时间序列模型中的应用

针对MEMS陀螺精度不高、随机漂移过大,提出了一种提高精度的方法。利用时间序列分析法建立模型,用Matlab进行参数估计及检验,最后基于该模型设计了卡尔曼滤波器对其进行误差补偿。对某三轴MEMS陀螺的实测动态数据运用上述建立的模型和滤波方法进行仿真。结果表明:该方法有效的减小了随机误差,明显的降低了随机漂移,从而提高了导航精度。     

基于GSAPSO-RVM预测模型的火控系统陀螺仪趋势预测

坦克中的陀螺仪能稳定火炮和瞄准线,提高瞄准精度,对其进行故障预测必不可少。以某型坦克火控系统的陀螺仪为研究对象,提出一种基于灰色模拟退火粒子群优化相关向量机的预测方法。对原始数据进行累加生成操作并归一化处理,来提取数据中隐含的信息;利用滑动窗口处理数据,使其适合模型输入;使用模拟退火粒子群算法优化混合核函数中的参数,利用寻优后的参数构建最终的预测模型。实验结果表明,经陀螺仪组获取的漂移数据预测值与真实值相差不大,可以准确地对数据进行趋势预测,为后续火控系统中陀螺仪部件的漂移故障趋势预测提供依据。     

Nitrosation and Nitration of Tetraacetyldibenzylhexaazaisowurtzitane

Tetraacetyldibenzylhitane (TADBIW) was subjected to debenzylation by nitrosating with inorganic materials available commercially to synthesize tetraacetyldinitrosohexaazaisowurtzitane (TADNSIW). TADNSIW was purified, and its structure was determined by FTIR, 1H NMR, MS and element analysis. The debenzylation reaction of TADBIW gave quantitative benzaldehyde as a by-product. This indicates that the reaction produces an imine cation as an intermediate. Hexanitrohexaazaisowurtzitane (HNIW) was prepared from unpurified TADNSIW with the yield over 96.0 % and the purity more than 98.0 %. And the mechanism of the reaction from TADNSIW to HNIW is proposed to be oxidation of nitroso and nitration of acetyl on the molecule of TADNSIW, This reaction system involved is simple, and the reaction can complete within a short time and under mild conditions. The product can be easily to separate and the waste disposed readily.     

A Robust Algorithm for Watermarking 2D Vector Maps with Low Shape-Distortions

The technique of watermarking has been introduced into 2D vector maps for many potential applications such as protecting the copyright of important GIS （geographical information system） data and tracing the data source of military maps. In most previous works, although the validity of the map data could be preserved during the embedding procedure, the shape-distortions of the map elements are usually neglected which would tend to degrade the invisibility of the watermarking schemes. A shape-preserving algorithm for watermarking 2D vector maps is presented in this paper. A 1D distance sequence extracted from the original map is adopted as the cover data instead of 2D coordinates. A watermark bit is represented by changing the distributions of the cover data. The embedding procedure induces lower shape-distortions than in former works. Experimental results indicate better invisibility of the proposed scheme, as well as its robustness to certain attacks such as map simplification, interpolation, additive noise and most geometric transforms.     

Open Rule-setting System Applied to Conceptual Design of Engines

Open rule-setting method advanced in this paper concentrates on providing designers of engines with a convenient way to express their design innovations and develop the expected prototypes in the early CAD stage, and constitute effective models for the following analysis process of CAE and CAPP. The problems arisen in the process of conceptual design with the traditional experience-based development method are analyzed. Based on those analyses, open rule-setting method is presented and some associated technical problems are discussed. The functional framework of open rule-setting system was built as software engineering methods. The speciality of the engine product as a kind of complex product and the requirement of the engine product based on its structural particularity to rule-setting system are considered carefully. A demonstration is supplied to illustrate how the open rule-setting method enhances the efficiency and quality of the engine conceptual design.     

Research on Linux Network Device Driver

By analyzing the working principle of Linux network device driver, discussing the Linux network driver structure and its key technologies, the general network driver structure and its design methodologies in Linux system are summarized. Through modifying the network device driver of Linux device driver 3rd version snull, c and improving the COW technology, the Zero-Copy technology in Linux （kernel version 2.6.11 ） is implemented. In the end, the success test tells us that the thorough analysis of network device driver is the foundation of many applications, and it also provides a certain improvement to a lot of real applications, even to military application development.     

Method for Measuring Velocity of Warhead Fragments Based on Photoelectric Detection

For measuring velocity and impacting position of single fragment of warhead, a non-contact measuring method is proposed, in which a six-light-screen array, a position indicator, a multi-channel chronograph and a computer are used.The principle of measurement is described. The key device of the system is a light screen array sensor which consists of six light screens allocated with certain geometrical parameters. When the fragment flies through the light screen array, the time of passing through each of the screens is recorded by the multi-channel chronograph. According to the time data and the geometrical parameters of the array, the velocity vector and the location of the fragment can be calculated immediately. The presented method can be used to locate the fragment and to measure the real velocity on its flying direction. It can also be used to measure the velocity of a fragment swarm after the system is engineered further.     

数码电子雷管中影响点火头性能因素分析

阐述了数码电子雷管中,点火药剂细结晶三硝基间苯二酚铅（LTNR）的制备工艺;从点火药剂的种类、加入黏合剂的质量分数、桥丝直径、点火头的电阻值、防潮漆的蘸涂等方面对点火头性能的影响因素进行了探讨;通过震动试验、并联起爆试验、延期精度检测与考核,试验结果表明：一次性合成的细结晶LTNR是制造数码电子雷管点火头较为理想的点火药剂,按技术要求生产的点火头性能指标能够满足行业标准要求。     

Improvement and Experiment of the Reamer in Vibra Cutter Against Wave Edge of Titanium Sheet Alloy Parts

By analyzing the influencing factors of part quality making of sheet alloy of titanium by vibra cutter, the shape of upper reamer is set as cylinder and wedge-shaped form, and the lower reamer as plain and hemicycle form, and its main structural parameters are defined as well. Then it is validated further that such improved vibra cutter reamer can be used to process curve-edged parts of titanium alloy sheet. The experimental result shows that the titanium alloy sheet parts processed by above equipment have no sharpen angles for convex parts and evident crevasse of concave-edged part. In summary, such improvement can eliminate the free-waved edge and improve the manufacture quality of titanium alloy sheet parts greatly.     

Experimental Study on the Small Flyer Initiating Behavior of Fine-grained Explosives

The initiating behavior of fine-grained explosives by small flyer is studied. The diameter of small flyer in this device is 1 ram. The test results indicate that the granularity of explosives has great effect on its flyer initiating sensitivity.The flyer initiating sensitivity of the fine-grained explosives is higher and the critical initiating energy is lower than that of common explosives. For common explosive, the flyer initiating sensitivity increases as the density is reduced. But for the fine-grained explosive, the test results are exactly opposite.     

Algorithm for Multi-laser-target Tracking Based on Clustering Fusion

Multi-laser-target tracking is an important subject in the field of signal processing of laser warners. A clustering method is applied to the measurement of laser warner, and the space-time fusion for measurements in the same cluster is accomplished. Real-time tracking of multi-laser-target and real-time picking of multi-laser-signal are introduced using data fusion of the measurements. A prototype device of the algorithm is built up. The results of experiments show that the algorithm is very effective.     

Influence of Installing Error on the Surface Shape Precision of the Axial Symmetry Aspheric Workpiece in Lapping

A method to calculate the surface shape error, which is caused by the installing error between the workpiece and the lapping tool in the process of form lapping, is proposed. The mathematical model which the installing translation error influences on the workpiece surface shape error is established. The changing rule of the error is simulated through the calculating example of the paraboloid workpiece. The results indicate that the surface shape error of the workpiece is increasing with the increase of the installing translation error, it is also increasing gradually along the center point of the curve surface to the edge, and the influence is severer to the curve surface with great curvature than that of the small curvature when the translation error is the same.